Rivet analyses
Track-based minimum bias at 900 GeV and 2.36 and 7 TeV in ATLAS
Experiment: ATLAS (LHC)
Inspire ID: 882098
Status: VALIDATED
Authors: - Thomas Burgess - Andy Buckley
References: - Expt page: ATLAS-STDM-2010-06 - arXiv: 1012.5104
Beams: p+ p+
Beam energies: (450.0, 450.0); (1180.0, 1180.0); (3500.0, 3500.0)GeV
Run details: - pp QCD interactions at 0.9, 2.36, and 7 TeV. Diffractive events should be included. Multiple kinematic cuts should not be required.
Measurements from proton-proton collisions at centre-of-mass energies of $\sqrt{s} = 0.9$, 2.36, and 7 TeV recorded with the ATLAS detector at the LHC. Events were collected using a single-arm minimum-bias trigger. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the relationship between the mean transverse momentum and charged-particle multiplicity are measured. Measurements in different regions of phase-space are shown, providing diffraction-reduced measurements as well as more inclusive ones. The observed distributions are corrected to well-defined phase-space regions, using model-independent corrections.
Source
code:ATLAS_2010_I882098.cc
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
namespace Rivet {
/// Rivet analysis class for ATLAS 2010 minimum bias analysis
class ATLAS_2010_I882098 : public Analysis {
public:
/// Default constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2010_I882098);
/// Initialization, called once before running
void init() {
// Projections
const ChargedFinalState cfs100(Cuts::abseta < 2.5 && Cuts::pT > 100 * MeV);
declare(cfs100, "CFS100");
const ChargedFinalState cfs500(Cuts::abseta < 2.5 && Cuts::pT > 500 * MeV);
declare(cfs500, "CFS500");
const ChargedFinalState cfs2500(Cuts::abseta < 2.5 && Cuts::pT > 2500 * MeV);
declare(cfs2500, "CFS2500");
// Book histograms
for (double eVal : allowedEnergies()) {
const string en = toString(round(eVal));
if (isCompatibleWithSqrtS(eVal)) _sqs = en;
if (en == "2360") {
book(_h[en + "pt500_nch1_eta"], 2, 1, 1);
book(_h[en + "pt500_nch1_pt"], 9, 1, 1);
book(_h[en + "pt500_nch1_nch"], 16, 1, 1);
continue;
}
bool is7TeV(en == "7000"s);
book(_h[en + "pt100_nch2_nch"], 18 + is7TeV, 1, 1);
book(_h[en + "pt100_nch2_pt"], 11 + is7TeV, 1, 1);
book(_h[en + "pt100_nch2_eta"], 4 + is7TeV, 1, 1);
book(_p[en + "pt100_nch2_ptnch"], 24 + is7TeV, 1, 1);
book(_h[en + "pt100_nch20_nch"], 34 + is7TeV, 1, 1);
book(_h[en + "pt100_nch20_pt"], 30 + is7TeV, 1, 1);
book(_h[en + "pt100_nch20_eta"], 26 + is7TeV, 1, 1);
book(_h[en + "pt500_nch1_nch"], 15 + (is7TeV ? 2 : 0), 1, 1);
book(_h[en + "pt500_nch1_pt"], 8 + (is7TeV ? 2 : 0), 1, 1);
book(_h[en + "pt500_nch1_eta"], 1 + (is7TeV ? 2 : 0), 1, 1);
book(_p[en + "pt500_nch1_ptnch"], 22 + is7TeV, 1, 1);
book(_h[en + "pt500_nch6_nch"], 20 + is7TeV, 1, 1);
book(_h[en + "pt500_nch6_pt"], 13 + is7TeV, 1, 1);
book(_h[en + "pt500_nch6_eta"], 6 + is7TeV, 1, 1);
book(_h[en + "pt2500_nch1_nch"], 36 + is7TeV, 1, 1);
book(_h[en + "pt2500_nch1_pt"], 32 + is7TeV, 1, 1);
book(_h[en + "pt2500_nch1_eta"], 28 + is7TeV, 1, 1);
book(_p[en + "pt2500_nch1_ptnch"], 38 + is7TeV, 1, 1);
}
raiseBeamErrorIf(_sqs.empty());
}
void analyze(const Event& event) {
// 100 GeV final states
if (_sqs != "2360"s) {
const ChargedFinalState& cfs100 = apply<ChargedFinalState>(event, "CFS100");
fillPtEtaNch(cfs100, 2, "pt100_nch2"); // nch>=2
fillPtEtaNch(cfs100, 20, "pt100_nch20"); // nch>=20
}
// 500 GeV final states
const ChargedFinalState& cfs500 = apply<ChargedFinalState>(event, "CFS500");
fillPtEtaNch(cfs500, 1, "pt500_nch1"); // nch>=1
if (_sqs != "2360"s) {
fillPtEtaNch(cfs500, 6, "pt500_nch6"); // nch>=6
}
// 2500 GeV final states
if (_sqs != "2360"s) {
const ChargedFinalState& cfs2500 = apply<ChargedFinalState>(event, "CFS2500");
fillPtEtaNch(cfs2500, 1, "pt2500_nch1"); // nch>=1
}
}
void finalize() {
for (double eVal : allowedEnergies()) {
const string en = toString(round(eVal));
double sf = safediv(1.0, _h[en + "pt500_nch1_nch"]->integral(true), 1.0);
scale(_h[en + "pt500_nch1_nch"], sf);
scale(_h[en + "pt500_nch1_pt"], sf / TWOPI / 5);
scale(_h[en + "pt500_nch1_eta"], sf);
if (en != "2360"s) {
sf = safediv(1.0, _h[en + "pt100_nch2_nch"]->integral(true), 1.0);
scale(_h[en + "pt100_nch2_nch"], sf);
scale(_h[en + "pt100_nch2_pt"], sf / TWOPI / 5);
scale(_h[en + "pt100_nch2_eta"], sf);
sf = safediv(1.0, _h[en + "pt100_nch20_nch"]->integral(true), 1.0);
scale(_h[en + "pt100_nch20_nch"], sf);
scale(_h[en + "pt100_nch20_pt"], sf / TWOPI / 5);
scale(_h[en + "pt100_nch20_eta"], sf);
sf = safediv(1.0, _h[en + "pt500_nch6_nch"]->integral(true), 1.0);
scale(_h[en + "pt500_nch6_nch"], sf);
scale(_h[en + "pt500_nch6_pt"], sf / TWOPI / 5);
scale(_h[en + "pt500_nch6_eta"], sf);
sf = safediv(1.0, _h[en + "pt2500_nch1_nch"]->integral(true), 1.0);
scale(_h[en + "pt2500_nch1_nch"], sf);
scale(_h[en + "pt2500_nch1_pt"], sf / TWOPI / 5);
scale(_h[en + "pt2500_nch1_eta"], sf);
}
}
}
/// Helper for collectively filling Nch, pT, eta, and pT vs. Nch histograms
void fillPtEtaNch(const ChargedFinalState& cfs, const int nchcut, const string& label) {
// Get number of particles and skip if event fails cut
const int nch = cfs.size();
if (nch < nchcut) return;
// Fill nch
_h[_sqs + label + "_nch"]->fill(nch);
// Loop over particles, fill pT, eta and ptnch
for (const Particle& p : cfs.particles()) {
const double pt = p.pT();
_h[_sqs + label + "_pt"]->fill(pt / GeV, 1.0 / pt);
_h[_sqs + label + "_eta"]->fill(p.eta());
if (_sqs != "2360"s && label != "pt100_nch20"s && label != "pt500_nch6"s) {
_p[_sqs + label + "_ptnch"]->fill(nch, pt / GeV);
}
}
}
private:
map<string, Histo1DPtr> _h;
map<string, Profile1DPtr> _p;
string _sqs = "";
};
RIVET_DECLARE_ALIASED_PLUGIN(ATLAS_2010_I882098, ATLAS_2010_S8918562);
}Aliases: - ATLAS_2010_S8918562